Thermostat Not Reaching Set Temperature

Without a properly functioning thermostat, staying comfortable inside your home may be impossible. This handy machine is the heart of our HVAC systems, keeping us cool in the summers and warm in the winters. But similar to all technology out there, issues can happen at some point. Luckily, some simple troubleshooting steps can help solve the most problematic thermostat issues.

Keep reading to learn what could be causing these thermostat problems, including some tips on how to fix the issue.

Reasons for a thermostat not reaching set temperature

If you notice that your home is consistently too hot or too cold, you may have a thermostat problem. Unfortunately, a variety of things could be causing this issue. Here are some of the most common culprits:

• You need a quick recalibration
• There’s loose wiring
• The thermostat is dusty, damaged, or not level
• Your AC unit or heater is too small for your residence
• The thermostat isn’t in the optimal location
• Your air conditioner or furnace is having issues
• Dirty or leaky ducts are causing airflow problems

While these issues may sound serious, some of them can be fixed in seconds. Others may require the expertise of an HVAC technician. Here are some tips on what can be done about these common system issues:

Thermostat isn’t calibrated properly

If your unit isn’t calibrated correctly, this could lead to a thermostat not reaching set temperature. Luckily, a simple recalibration should do the trick. This problem typically occurs with newer thermostats or systems that just experienced a power outage. Older thermostats may also need a recalibration over time. Also, if this device continually needs to be recalibrated, consider replacing the unit.

To check the calibration, the process is easy. Simply place a thermometer close to your thermostat and see if the temperatures match up. If the temps are off by a degree or two, you’ll want to call an HVAC professional. These providers typically offer further testing to determine how to fix the problem.

You have loose wiring

Loose wiring is another common culprit to a thermostat not reaching set temperature. This can cause display issues with your unit, possibly leading to temperature problems. Luckily, this is a common issue that can be easily fixed by an HVAC professional.

Corrosion could also be happening with your wiring, or there could be a buildup of dust, which could also lead to system issues. Once an HVAC expert opens up your thermostat, they’ll be able to determine the problem.

Thermostat is broken, dirty, or not level

If your home’s thermostat wasn't installed correctly, this could be why it’s having a problem. A dirty unit is another reason that could be causing issues. If you have a dusty thermostat, simply wiping away the debris may solve the problem. However, you should always call a professional to take care of this. While dusting may sound pretty straightforward, thermostats are very sensitive and must be properly cleaned using specialized techniques.

If you have a thermostat that isn’t level, this could be the culprit. When these devices aren’t level and flush against the wall, this can knock everything out of whack. More specifically, this can cause a problem with the pin connection between your thermostat and its backplate. Again, as this requires a sensitive repair, which should be handled by an HVAC professional.

If your thermostat has a broken component, this part should be replaced right away. But sadly, broken thermostat parts aren’t easy to fix. This is why you should call an HVAC expert. The last thing you would want to happen would be to try to fix the issues and make things worse. However, if you have a broken part, you may be better off replacing the thermostat; repairs generally cost more than buying a completely new device. But be sure to speak with an HVAC professional before making this decision.

Your HVAC system is too small

If you're dealing with a thermostat not reaching set temperature, the problem may not be caused by your thermostat – the issue could stem from your actual air conditioner or heater. One common problem is a system that’s too small for your home.

Depending on the size of your residence, your unit may not be able to keep up with the demand. If you have a large home, your system may struggle to heat or cool it all. This issue typically happens after building onto a home or converting a space that wasn’t previously temperature-controlled. If this has happened to you, you can either replace your system or add an additional heating or cooling solution, such as a ductless system or portable air conditioner.

Your thermostat isn’t positioned effectively

Another reason for a thermostat not reaching set temperature may involve the location of your thermostat. If this device is found in an area that is either hot or cold, this could be your problem. As these locations have different temperatures than the rest of your home, it could display an inaccurate representation of the actual indoor temperature.